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A. Aging is generally referred to as a decrease in capacitance over time in EIA Class II capacitors. It is a natural and unavoidable phenomena that occurs in all ferroelectric formulations used as the dielectric material. Aging is reversible and occurs due to changes in the dielectric’s crystal structure with temperature and time. Aging is typically reported as a percent capacitance loss per decade of time. Because aging is logarithmic in nature, the loss of capacitance is greatest in the first 10 hours of age.
Figure 1 : Capacitance Aging Characteristic(Taken from the TDK Chip Capacitor Catalog - Document ID: BBE-008B, 04/92)
Note : The dissipation factor also ages, decreasing several times faster than the capacitance. And, EIA Class III and IV also exhibit aging characteristics. Industry “official” definitions of aging can be found in EIA-521 and IEC-384-9.